NMS-8250 - alternatives to MFRSCC+SD?

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By Louthrax

Prophet (2406)

Louthrax's picture

06-04-2016, 18:11

I should do that OPAMP mod on my 8250 one day... Anybody knows if Luppie still has some boards to sell ?

By Daemos

Paragon (1955)

Daemos's picture

06-04-2016, 19:17

he does. Just send him a e-mail.

By Bastiaan

Champion (333)

Bastiaan's picture

06-04-2016, 20:30

Good idea to promote the opamp in this thread. I'm sending Luppie an email....

By mfeingol

Champion (291)

mfeingol's picture

08-04-2016, 19:08

On a related note, does anyone have any experience connecting a generic floppy emulator to an 8250? Are any power or signal-related mods needed, or will the default power and floppy cables from the 8250 just work?

http://ebay.to/1S1z25K

By Wild_Penguin

Hero (641)

Wild_Penguin's picture

08-04-2016, 19:26

I have used the Lotharek SDcard floppy emulator rev C on my NMS8255. It works without any additional modifications to the NMS8255. I don't know about other floppy emulators, but I'd presume if they follow the same standard (Shugart), they should work. You can even put PC floppy drives inside an NMS8250/55/80 (with very little modifications - IIRC, for HD floppy detection, in case you are using a HD drive, since the MSX can only handle DD drives / floppies, and slave/master selection).

The Lotharek has it's own quirks - for example, it uses it's own file format (no .dsk loading from the SD card!) which will mean constant file conversion. Also, it is not cheap. But, MFRSCC+SD still offers more value (HD emulation FTW!) - except that a floppy emulator will not take up a slot. YMMV - If you can get a cheap floppy emulator, it might be worthwhile, even in addition to the MFRSCC+SD!

By Louthrax

Prophet (2406)

Louthrax's picture

12-04-2016, 15:17

Manuel, I have a few questions about the MFRSCC+SD "clone PSG" feature :

  • Does the cloned MFR PSG sound add to the existing MSX PSG or is the MSX PSG muted ?
  • When /P1 option is used at flash time, the ROM is not patched (the MFR PSG is just configured to use same ports as MSX PSG) ?
  • Would it be possible to enabe / disable the "clone PSG" mode after boot (from DOS) ? (I can make a small .COM program if that's the case).

Thanks in advance !

By Meits

Scribe (6461)

Meits's picture

12-04-2016, 15:20

That would be quite handy as the original PSG of one of my machines is almost mute.

By Guillian

Prophet (3457)

Guillian's picture

12-04-2016, 15:58

Louthrax wrote:

Does the cloned MFR PSG sound add to the existing MSX PSG or is the MSX PSG muted ?

It is added.

Louthrax wrote:

When /P1 option is used at flash time, the ROM is not patched (the MFR PSG is just configured to use same ports as MSX PSG) ?

Yes, that's right.

Louthrax wrote:

Would it be possible to enabe / disable the "clone PSG" mode after boot (from DOS) ? (I can make a small .COM program if that's the case).

Yes. You can control PSG clone feature with bit 3 of #7FFC

By Louthrax

Prophet (2406)

Louthrax's picture

12-04-2016, 16:19

Great, thanks Manuel!

By AxelF

Champion (389)

AxelF's picture

12-04-2016, 16:39

Is it possible to change more settings this way ?
and does a technical manual exist for the MFRSCCSD where all this is explained ?

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